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1.发明授权
公开(公告)号：US4808826A
公开(公告)日：1989-02-28
申请号：US849324
申请日：1986-04-08
申请人： Chun B. Lim , Richard Chaney , Felix Jih , Tim Johnson , Steven E. King
发明人： Chun B. Lim , Richard Chaney , Felix Jih , Tim Johnson , Steven E. King
CPC分类号： G01T1/1647 , G01T1/1642
摘要： In scintillation cameras, spatial or linearity correction is accomplished utilizing a weighted average of correction vectors in the region of the apparent location of scintillation events. Such vectors are developed in a calibration step using a pinhole or slot apertured mask. On the fly, vectors beyond those next adjacent the apparent location are used for correction, which are constrained to exhibit continuity in both the functional value, and at a minimum the first derivative, but which may include continuity in higher order derivatives also. One such correction function, which insures continuity in both the functional value and its first derivative, is called a Hermite interpolation function.
摘要翻译： 在闪烁照相机中，利用在闪烁事件的明显位置的区域中的校正矢量的加权平均来完成空间或线性校正。 这样的载体在使用针孔或槽孔掩模的校准步骤中显影。 在飞行中，超出邻近表观位置的矢量的矢量被用于校正，其被限制为在功能值和至少一阶导数上表现出连续性，但是也可以包括高阶导数的连续性。 确保功能值及其一阶导数的连续性的一个这样的校正函数被称为Hermite插值函数。
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公开(公告)号：US4582995A
公开(公告)日：1986-04-15
申请号：US621418
申请日：1984-06-18
申请人： Chun B. Lim , Richard L. Chaney , Roger J. Kump
发明人： Chun B. Lim , Richard L. Chaney , Roger J. Kump
CPC分类号： G01T1/2985 , A61B6/037
摘要： A method for correcting predictable errors in the location of detected scintillation events acquired during emission computed tomography by a rotational scintillation gamma camera system. The method includes calibrating the rotational scintillation camera system and generating a look-up table comprising a set of pairs of x and y offset values, one pair for each viewing angle. The calibration reflects systemic deviations in the location of the rotating camera head detector measured in terms of x and y coordinates in the frame of reference of the detector for a plurality of view angles relative to the geometric ideal expected path. Once a look-up table is generated for a camera system, the detected location of each gamma event is altered in real time by adjusting in the camera head the x,y coordinate location of each event by the x,y offset values previously generated for the corresponding viewing angle associated with the detected event.
摘要翻译： 一种用于校正通过旋转闪烁伽马相机系统在发射计算机断层摄影期间获取的检测到的闪烁事件的位置中的可预测误差的方法。 该方法包括校准旋转闪烁照相机系统并产生包括一组x和y偏移值的查找表，每个视角为一对。 校准反映了相对于几何理想预期路径，在检测器的参考系的x和y坐标上以多个视角测量的旋转相机头检测器的位置的系统偏差。 一旦为摄像机系统生成查找表，通过在摄像头中调整每个事件的x，y坐标位置，先前生成的x，y偏移值，为每个伽马事件检测的位置进行实时改变 与检测到的事件相关联的对应视角。
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3.发明授权Scatter elimination technique and apparatus in radionuclide emission and transmission imaging in a nuclear camera 失效核相机中放射性核素发射和透射成像中的散射消除技术和装置
公开(公告)号：US5633499A
公开(公告)日：1997-05-27
申请号：US561273
申请日：1995-11-21
申请人： Chun B. Lim , Barry D. Kline , Vitaliy Rappoport
发明人： Chun B. Lim , Barry D. Kline , Vitaliy Rappoport
CPC分类号： G01T1/1648 , G01T1/1642
摘要： Scatter errors are eliminated from a gamma camera image on a spatially dependent basis. A global scatter curve is obtained and normalized for each local area. Based on this local scatter curve and the local spectrum, a local correction factor is obtained. The correction factors are then used to remove scatter errors from the image. The method provides spatially-dependent correction based on measured scatter. It does not require the camera's zero-scatter response to be known and it does not require the fitting of spectra either by a polynomial or by a theoretical scatter function. It allows for rapid determination of scatter correction factors for each pixel in an image. It produces excellent results for both transmission and emission images.
摘要翻译： 在空间依赖的基础上从伽马相机图像中消除散射误差。 获得全局散射曲线并对每个局部区域进行归一化。 基于该局部散射曲线和局部光谱，得到局部校正因子。 然后使用校正因子来从图像中去除散射误差。 该方法基于测量的散射提供了空间相关的校正。 它不需要相机的零散射响应是已知的，它不需要通过多项式或理论散射函数拟合光谱。 它允许快速确定图像中每个像素的散射校正因子。 它可以为传输和发射图像产生出色的结果。
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公开(公告)号：US5491342A
公开(公告)日：1996-02-13
申请号：US338438
申请日：1994-11-10
CPC分类号： G01T1/1648
摘要： A gamma camera is calibrated at different photon energies to provide several different calibration arrays. The calibration arrays are used to correct the camera image according to the energy of the photons detected from the body to be examined. The calibration array obtained from the photons having an energy closest to the photons detected from the body may be used. Another alternative is to form an interpolation array based on two or more calibration arrays obtained with photons having energies bracketing those from the body.
摘要翻译： 伽马相机在不同的光子能量下进行校准，以提供几种不同的校准阵列。 校准阵列用于根据从被检体检测到的光子的能量来校正摄像机图像。 可以使用从具有从身体检测到的最接近光子的能量的光子获得的校准阵列。 另一个替代方案是形成基于两个或更多个校准阵列的插值阵列，所述校准阵列由具有包围身体的能量的光子获得。
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公开(公告)号：US5107121A
公开(公告)日：1992-04-21
申请号：US679173
申请日：1991-03-26
CPC分类号： A61B6/0457 , G01T1/1648
摘要： A gantry and pallet assembly using scintillation cameras to acquire data emitted from radiopharmaceuticals previously introduced into a patient. The radiopharmaceuticals accumulate in a predetermined region of interest within the patient. The gantry can perform both whole body and single photon emission computed tomograph (SPECT) scans. The gantry has two scintillation cameras mounted in a diametrically opposed manner on and in close proximity to a rotation ring. Each camera can be radially translated relative to the rotation ring simultaneously with the rotation of the rotation ring. The gantry is capable of being translated along a pair of translation tracks so that a pallet upon which a patient lies passes therethrough. The pallet assembly has a storage carriage which supports a substantially rectangular flat pallet upon a slidable frame, and a curved pallet upon an extension assembly. The storage carriage can be slid away from the gantry or close to the gantry. When the storage carriage is close to the gantry either pallet can be easily transferred to a vertically adjustable pallet support used during scanning procedures.
摘要翻译： 使用闪烁照相机的龙门架和托盘组件来采集先前引入患者的放射性药物发射的数据。 放射性药物在患者体内的预定感兴趣区域积聚。 台架可以执行全身和单光子发射计算机断层扫描（SPECT）扫描。 台架具有两个闪烁照相机，其在径向相对的方式安装在旋转环上并且紧邻旋转环。 每个摄像机可以与旋转环的旋转同时相对于旋转环径向平移。 龙门架能够沿着一对翻译轨道平移，使得患者所在的托盘穿过其中。 托盘组件具有一个储存托架，该支架在可滑动的框架上支撑基本为矩形的平板托盘，在延伸组件上具有弯曲托盘。 储物架可以远离龙门架或靠近龙门架。 当托架靠近龙门架时，托盘可以很容易地转移到扫描过程中使用的可垂直调节的托盘支架上。
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